How to bin struct fields based on value in another field?

Question

Nicholas Kavouris 2023-1-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1898570-how-to-bin-struct-fields-based-on-value-in-another-field

回答： Walter Roberson 2023-1-22

I have a structure with multiple fields. I would like to plot a histogram of values of data in one field based on conditions in another field of each row of the struct. How would i do this?

EX:

test(1).initial=13

test(1).final=43

test(2).initial=8

test(2).final=58

test(3).initial=[26,14]

test(3).final=52

i would like to bin test.final so rows with corresponding test.initial(1) values 0-10, 11-20, 20-35 are grouped together

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Nicholas Kavouris 2023-1-22

i only want to bin based on test.initial(1), any index beyond 1 is ignored

Nicholas Kavouris 2023-1-22

i added this in as the struct i am working with has a variable number of indices in each row in the column id like to sort by

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Answer 1

Walter Roberson 2023-1-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1898570-how-to-bin-struct-fields-based-on-value-in-another-field#answer_1153960

在 MATLAB Online 中打开

initials = arrayfun(@(S) S.initial(1), test);
finals = [test.final].';  %assuming only one value per entry
bins = discretize(initials, [0 11 21 35]);
splitapply(@histogram, finals, bins);
legend({'[0-11)', '[11-21)', '[21-35]'});